看了下《深入虚拟机》相关章节，还是存在一些字节码的疑惑

前几天咨询了大家字节码相关问题
看了一遍《深入理解虚拟机》，部分指令和语法是明白了，但是依然存在一些疑惑
在下面字节码中标出了，麻烦懂的朋友指点下
多谢了
类文件

package core.object_create;

public class ObjectTest {
    private String name="v2";

    public void hi(){
        int i =777;
    }
}

字节码

// class version 56.0 (56)
// access flags 0x21
public class core/object_create/ObjectTest {

  // compiled from: ObjectTest.java

  // access flags 0x2
  private Ljava/lang/String; name

  // access flags 0x1
  public <init>()V
   L0 //这里在申明什么
    LINENUMBER 3 L0  //这个语法是啥意思
    ALOAD 0
    INVOKESPECIAL java/lang/Object.<init> ()V
   L1
    LINENUMBER 4 L1
    ALOAD 0
    LDC "v2"
    PUTFIELD core/object_create/ObjectTest.name : Ljava/lang/String;
    RETURN
   L2
    LOCALVARIABLE this Lcore/object_create/ObjectTest; L0 L2 0
    MAXSTACK = 2
    MAXLOCALS = 1

  // access flags 0x1
  public hi()V
   L0
    LINENUMBER 7 L0
    SIPUSH 777
    ISTORE 1
   L1
    LINENUMBER 8 L1
    RETURN
   L2
    LOCALVARIABLE this Lcore/object_create/ObjectTest; L0 L2 0   //这句
    LOCALVARIABLE i I L1 L2 1 //以及这句分别在申明什么
    MAXSTACK = 1
    MAXLOCALS = 2
}